The document summarizes a workshop about permeable paving. It discusses how permeable paving can help control stormwater runoff through infiltration and storage in aggregate layers below the pavement. Key benefits include eliminating detention ponds, replenishing groundwater, improving water quality by filtering pollutants, and providing traction control on roads by reducing ice and water. The document also provides details on permeable pavement components, soil infiltration rates, examples of permeable pavement installations, and pollutant removal effectiveness.

1. Permeable Paving Workshop by Tom Barrett Green Water Infrastructure, Inc.

2. The GREEN Economy

3. Low Impact Site Development

5. Detention and Volume Contro l Stormwater Mitigation Detention Underneath Elimination of Detention Ponds

6. How Much Water ? Rainfall Surface Area Water Volume 1/4” 43,560 ft 2 6,800 gallons 1/2” 43,560 ft 2 13,600 gallons 1” 43,560 ft 2 27,200 gallons

7. Base Storage Capacity Base Depth Surface Area Void Space Storage Capacity 12” 43,560 ft 2 40% 130,300 gallons 18” 43,560 ft 2 40% 195,500 gallons 24” 43,560 ft 2 40% 260,700 gallons

8. Infiltration Replenishes the Groundwater Supply Currently 50% of our Drinking Water In the Future 80% of our Drinking Water

9. Soil Infiltration Rates Soil Texture Infiltration (in/hour) Sand 8.30” Loamy Sand 2.41” Sandy Loam 1.02” Loam 0.52” Silt Loam 0.27” Sandy Clay Loam 0.17” Clay Loam 0.09” Silty Clay Loam 0.09” Clay 0.06”

10. Improved Water Quality Removes Suspended Solids Removes Phosphorus, Nitrogen, and Metals Removes Harmful Pollutants - Oil Water Polishing - the final step in cleaning

11. Pollutant Removal *Infiltration Trenches & Porous Pavement Pollutant Median Pollutant Removal* Suspended Solids 95% Phosphorus 70% Nitrogen 51% Metals 99%

12. Roadside Traction Less Water

13. Roadside Traction Less Ice

14. Design Considerations Rainfall Intensity Rainfall Duration Runoff Coefficient is Zero Underdrain for Soil Infiltration Rates of less than 1/2” per Hour Release Rate

16. Components of Permeable Pavement Pavement Joint Aggregate Setting Bed Aggregate Base Aggregate Subbase Aggregate Subgrade Edge Restraint Under-Drain Geotextile Fabric

17. Pavement Pavers Concrete Asphalt Single-sized Aggregate Resin Bound

18. Joint Aggregate Pavers only Initial Filter 1/4” crushed, angular, chip stone ASTM No. 8

19. Setting Bed Aggregate Used in all systems Smooth Leveling Course No Sand ASTM No. 8

20. Base Aggregate Used when subsoil conditions allow Minimum thickness 4” ASTM No. 57

21. Subbase Aggregate Not always necessary Dictated by Subsoil Conditions Used for additional structural stability ASTM No. 2

22. Subgrade Existing Soil Percolation California Bearing Ratio Penetrometer

23. Edge Restraint Vitally Important Concrete Curb for Vehicular Traffic Plastic may be Sufficient for Non-vehicular areas.

24. Underdrain Pipe Subsoil Permeablity Detention Requirements Release Rates Not Always Necessary

25. Geotextile Fabric Based Upon Existing Soil Characteristics Between Subsoil and Base Aggregate

26. Components of Permeable Pavement Pavement Joint Aggregate Setting Bed Aggregate Base Aggregate Subbase Aggregate Subgrade Edge Restraint Under-Drain Geotextile Fabric

28. Police Station Aurora, Illinois

29. Buckingham Fountain Chicago, Illinois

30. Porous Paving • Green Roofs • Rain Gardens • RainWater Harvesting NEW TOOLS FOR SUSTAINABLE SITE DEVELOPMENT

33. Special Thanks

34. P.O. BOX 124 WESTFIELD, INDIANA 46074 317-674-34949 GREEN WATER INFRASTRUCTURE, INC. TOM BARRETT